noun a first principle or element.
2. primordial ·adj first in order; primary; original; of earliest origin; as, primordial condition.
3. primordial ·adj originally or earliest formed in the growth of an individual or organ; as, a primordial leaf; a primordial cell.
4. primordial ·adj of or pertaining to the lowest beds of the silurian age, corresponding to the acadian and potsdam periods in american geology. it is called also cambrian, and by many geologists is separated from the silurian.